变位词程序的实现

    最近在看《编程珠玑》,挺有意思，惊叹于作者思维的巧妙。闲来无事，就想着开了博客练练手。内容都是从书上的，我就用C#简单实现了一下。鄙人只是刚出道的小小程序猿，第一次写博客，实在写不出太优秀的代码，望看到的人多多见谅哈。。有错误或者意见啥的随便提，也是我学习的机会。

   书上的内容大致是：给定一个英语词典，找出其中的所有变位词集合。例如：“pots”，“stop”和“tops”互为变位词，因为每一个单词都可以通过改变字目的顺序来得到。

   因为手里也没词典，就用24个字母随机组合创建了一个词典（并不是真正的单词，字母随机组合3-10位）。就是在txt里边一行一个单词

      public static string[] Letter = { "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", 
 "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z" };
        /// <summary>
        /// 创建字典
        /// </summary>
        /// <param name="count">要创建的单词数</param>
        public static void CreateDictionary(int count)
        {  
            using (FileStream fs = new FileStream(Path, 
            FileMode.Create,FileAccess.Write))
            {
                using (StreamWriter sw = new StreamWriter(fs, 
               Encoding.UTF8))
                {
                    Random r = new Random();
                    StringBuilder sb = new StringBuilder();
                    for (int k = 0; k < count; k++)
                    {
                        sb.Append(CreateWord(r));
                        sb.Append("
");
                    }
                    string words = sb.ToString();
                    sw.Write(words);
                }
             
            }
              
        }
        /// <summary>
        /// 模拟创建单词   生成字典
        /// </summary>
        /// <param name="r"></param>
        /// <returns></returns>
        public static string CreateWord(Random r)
        {
            string word = "";
            //先随机选择一个单词位数 4到10位
            int bit = r.Next(3, 10);
            for (int i = 0; i < bit; i++)
            {
                word += Letter[r.Next(0,Letter.Length-1)];
            }
            return word;
        }

 然后就是变位词查询的实现了，先对每一个单词中的字母进行排序，再比较单词是否相同即可。排序用冒泡排序，然后取出变位词那里的实现写的实在不咋滴，实在是笨想不到好办法，只好两个数组都遍历了一边去查找。

        /// <summary>
        /// 开始查找
        /// </summary>
        public static string Search(string filePath)
        {
            if (!File.Exists(filePath))
            {
                return "文件不存在!";
            }

            Stopwatch watch = new Stopwatch();
            watch.Start();//开始计时
            string printfPath = filePath.Substring(0, 
            filePath.LastIndexOf('\')) + "\output.txt";//输出路径
            using (StreamReader sr = new StreamReader(filePath, 
            Encoding.UTF8))
            {
                string allWords= sr.ReadToEnd();
                string[] wordArrary = 
                System.Text.RegularExpressions.Regex.Split(allWords, 
     "
", System.Text.RegularExpressions.RegexOptions.None);

                //用来接收排序后的单词
                string[] sortArray = new string[wordArrary.Length]; 
                //1.先对每个单词排序
                char[] array; //避免创建过多变量
                char temp ;
                for (int k=0;k< wordArrary.Length;k++)
                {
                     array= wordArrary[k].ToArray();
                    //使用冒泡排序对单词每个字母排序
                    for (int i = 0; i < array.Length; i++)
                    {
                        for (int j =i+ 1; j < array.Length; j++)
                        {
                            if (array[i] > array[j])
                            {
                                temp = array[j];
                                array[j] = array[i];
                                array[i] = temp;
                            }
                        }
                    }
                    sortArray[k] = new string(array); //存入新数组
                }

                //2.判断数组元素是否相同，相同则输出
                using (StreamWriter sw = new StreamWriter(printfPath,false))
                {
                    int[] sign = new int[sortArray.Length]; //标记 0未查询 1已查询
                    for (int i = 0; i < sortArray.Length; i++)
                    {
                        Console.WriteLine("共" + sortArray.Length + "个单 词，......正在查询到第" + (i + 1) + "个");
                        if (sign[i] == 0)
                        {
                            sw.Write(wordArrary[i].ToString() + "    ");
                            for (int j = 0; j < sortArray.Length; j++)
                            {
                                if (i != j && sortArray[i] == sortArray[j])
                                {
                                    sw.Write(wordArrary[j].ToString() + "    ");
                                    sign[j] = 1;
                                }
                            }
                            sw.WriteLine();
                        }
                    }
                }

            }
            watch.Stop();//结束

            return "完成！共用时" + watch.ElapsedMilliseconds +"ms。请打开" + printfPath + "查看";
        }

 然后是main函数：

         /// <summary>
        /// 字典路径
        /// </summary>
        public static string Path
        {
            get
            {
                return System.Environment.CurrentDirectory + "\words.txt";
            }

        }

        static void Main(string[] args)
        {
            string filePath = "";
            Console.WriteLine("按1创建字典，按2执行输入字典路径并查找变位词......");
            ConsoleKeyInfo key = Console.ReadKey();
            if (key.KeyChar.ToString() == "1")
            {
                Console.WriteLine("正在创建......");
                CreateDictionary(5*10000);
                Console.WriteLine("创建完成，任意键开始查找变位词......");
                filePath = Path;
                Console.ReadKey();
            }
            else
            {
                Console.WriteLine("请输入路径......");
                filePath = Console.ReadLine();
            }

            //开始查找
            Console.WriteLine("正在查找......");
            Console.WriteLine(Search(filePath));

            Console.ReadKey();
        }

 速度实在有点慢。。。5万单词就用了20多秒，望高人指点指点=-=